The scores on the cards are based on what we know about the past and continuing activity of Mayon.

Explosivity (Volcanic Explosivity Index) – 4. Mayon has frequent, moderately explosive eruptions, and is the most active volcano in the Philippines. In recent years activity has included the eruption of lava flows, and explosions from the summit crater at the top of the volcano.

Deadliness. 129. The eruptions of Mayon are usually relatively small, but there is a significant hazard from lahars, as the freshly deposited ash and rubble is rapidly washed downstream in rainy-season floods, and there have been very damaging explosive eruptions in the past. In 1814, a major eruption buried the nearby town of Cagsawa under lahar and pyroclastic flow deposits.